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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055e00207b8ddc1125afa1442a57b57e2dcca0bb0dfa15254d7b4eaaf732f6c7' 
  AND token = 'w3maQeVWQCo1mjao2esWjBKt4acp29cHnyoLONT0oMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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