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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f9232f5d93a617e2a98d44b64c2f3fbb6daf372f33a23eb4935183a7550ca5' 
  AND token = '5yYvi4d6yPVrJJKhlPraUJpAUfue574D6d1CBkT60qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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