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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85e954389e54ce1073412a19b97fe89bd1c1d98ce99c0b5c041b6996baec71e' 
  AND token = 'VQqk73aKoohdcxp413ZocS30hML4sCwbuSKsEGGQsmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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