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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c451a0ecc56adb14877cb258e34f2263d2fbfe73f4a0f12b8798081f184ec2' 
  AND token = 'DLZ5LJMRjHoyBU73hteSuAfe/Ir7iUcky9A7vMZMUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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