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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c664ade4cab3be93504f64f23b4e1b8882d4a933691c5c1c974716478abc080d' 
  AND token = 'v6oVo7+kMLQ9lgxArsJ7PcTZ6n0YBoaziXdH6nsGrtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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