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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b70f423bfc732762ecf398f632a6e3ba4d413ca9b2fe38ae1c66b8fd595ebe' 
  AND token = 'QpdzR9o7U2JJ1oKPR4Yrokd83kRe9WVu6SLRfnpgTOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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