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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7a39aa6ddfdae4c55018ef53d145c9de3552239165ff7f8112436cc90cf3fe' 
  AND token = 'YMo7+4JU4yrBTUKBuGPVVYa8aAEuY0n/AEOnzE5B2ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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