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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dc9ae5ebce59d70bbfd3de2ca1e14e7b2002eac4d82a9c4035f15592aaf1ad' 
  AND token = '7ttnFU3sRJsi3JbBgECq0vugt/tEgKzwQc1jJ+CRehU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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