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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4862e52ba2e1bb8304932758e1028efb62bfa9d6fcdba58edc03de1369e30f66' 
  AND token = 'bgSD6NRrqXvT2U7E8NgCK0ZPwhnw7NLjzSB3wIF4eEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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