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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8ebd5f25a11d78d18f623d292a2a95fcddce522108a8120fbe090972f9bbf7' 
  AND token = 'pNC59U0U/So5XlAbP34C8ym7sR4ElTX+VYJwS0t/HtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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