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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8c8e8e044e26bbadb35cbf3b091625f0f24e22478c7f4d5aa41d82b94df329' 
  AND token = '1FMtfvNKfkwfp/9v21K/llBrKBAl7Y05Q/U7MCUdxTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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