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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2724beff5df41465c36153141398360f53700b828f9738895e580b8051928c1' 
  AND token = 'YmMLXye2jzK3+A4IKKZ1ALKnOy6p7WSF8sDeeavNEak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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