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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89a9545dcc542afb6b85752f1e6aea256b317ba603079c11cf7d57482a8fec9' 
  AND token = 'eHewQuGCHDTRs1zI5hjf9jgCDof0HKL3ITGcNOBXZGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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