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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d12ac2f89d738d468895772789ce58922236f1f4b520c230b61be26db2c6020' 
  AND token = '1mQaALDxM9k28F/O8AgF81z/wNYjEk9r8+fw+v1xjTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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