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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dda05a6a8a3604577cad70181ae473449149995be13cc431b39e479b019050' 
  AND token = '/nw4l/E5g9VtLKx7sWtrt6tV3I5lKlMQmjTV/jWRBCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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