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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb007d8eaa79965622d00d18307e0212a83084a65361beebc6b5c1fed4487fb' 
  AND token = '1MTo5HUbLk0DezAKV0HevFkRwnbi4kIyEJZTkWSSqko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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