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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448312cd9fe05ec86b96ea500bab4deb213e622801a8586d2b8d535053183161' 
  AND token = '6wAVqXQVJmepG5Ymn5ln6RYKTKp9Z0t1meUXhfCaY7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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