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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1be3b15cc188ec7c7dba254bd368fe167acbac64d38a5d36b9dd441890139ca' 
  AND token = 'k+jb0HXNPMNKD2mgm3rFNIFuhZSzT1Ex7QTkC56pups=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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