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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42350b0866b8e50c31e7854b352dac8f14c2f572609200ab54b888545032aa2c' 
  AND token = 'PHrH5z9vCBfdxLQ96GojONsjQbQo517CK2jAhEdQAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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