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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0754cf800b5113df4ce9dfeeb9754c06ed3d10eab3bba9fd7aa0c8b96f3bc6' 
  AND token = '51XGE519u7rH8I6SNFJpA3aPfh2tNbrHDys/rc1YUkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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