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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff01bd87551ff8af0055ff1bb69598744bfc59841693fbd00353c42521b6e9aa' 
  AND token = 'ZMuxQ/JYCuSrv5nJB2hBsd9f9amw67pk96dQaIiQCG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}