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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5e3475b587136606a084761d739e23d3cca49361ad74060499edd7c8a4d635' 
  AND token = 'IF4bNhY1KE8iUpC7/lHdf6MG1d3iup7PE9Auab6Dh48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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