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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d147ce9df3f6486ce46915d0e567ceba63df6c9430bd22966ba989463a2417' 
  AND token = 'IqeCRaEzt1+HXLyE44PM4MqktfILXufu0RP7iqDdkKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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