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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef091971e7d3b04e6baca028f81c3740baf794dea841b452250ec626dd5c7165' 
  AND token = 'dz8rocPKdRyCV+QB7ASI3pEElSHA3XEQQBDNdmkySfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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