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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac16b03f01a5b5376a492e2fa190617708bb8a17c6ce900007f45eb90ea1ef5' 
  AND token = 'rFXWbBYJyoD3uMRyELK7mrLigPY8H5/wLQ2uRMzeO6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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