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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efabff446c585b63fbf19bfa3048e0aa687299e540e48531bd68f3387664d96f' 
  AND token = 'xiOlw1pOj04HNbgXzB8M8y4L8be0qSf3WZnPiNrfGa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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