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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1371cb107ca1550c8bd235b25596b0a5d64ea33dbe670c1cddb3c74d372a1e' 
  AND token = 'KtYkF73w4rM+cxf8/53N5Xbemw8GqEJBbh0zX9zESIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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