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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebad41562a04c8ac67ef866af42bba85eb52bdb5bcbee2074400f4893a34b6c' 
  AND token = '6Hb2oJ5ND99Jr9ncMX3osDVhDDOiTdY5+yTn4M+g1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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