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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ca25200d42ea08d50cc1c8e096148d881f97154854e7883a341d1891a11900' 
  AND token = 'BsWFgmL5aDcZ+WAU0OwSNV5jBmbXNS0d9JGgdcy2w34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00368

JSON explain

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