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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b24eb00f7b01b6d9d65a6ae31dff2f8b70405cb0800466f2f37bb69fdc23d63' 
  AND token = 'cvf7JkPgVZJBNisRQt2AWD8tLtOreLBH2Ek1qEIxkV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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