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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6e90445d545ec45b79a535db166a042a379008e2238665b43315d9aa0908c0' 
  AND token = '3hdMAatW6QAAggnf54T1vM9IkD61FJwZNQdA3eg+6Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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