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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc5894b9eb94b605d5b494835693bfa4578d1e675a8ffcd4a2099b8e11e0d40' 
  AND token = '/vOgXCqC1D6oF38wc1sdtyPaNTi6hDZ0/GQhWFuqZWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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