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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec0d1c3d34117cc96081262bd33a4a56fb355dcd7c1686f514a092b2b30119d' 
  AND token = 'OHlLxpOHdDVabErS3B80oGr4ThYCO4H0joCQfAND++s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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