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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff899bc76c48a4f759b29ac20e5f404007b5901d03402f77d2b42e9e118fa07c' 
  AND token = 'VYNBmiM3iWS2FhGccjFmny/YgEqBclI8I5qQszio9Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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