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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0801843f0bc2efed192b8f6346901b1acd6a03ec6c6892091f077e6f614019b' 
  AND token = 'Iv1azQht6EJaVI8VB8uXD5ULkFA4razaZ4om5CT5EKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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