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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e620ece191da0075a2b2b1234874d590ff9b6a3cb55e3bad4e58e9637972e7f' 
  AND token = '9yVXqjI6qXJkJ0Yay+b1rGh6YY7Ive5qJ4hlwX7GKsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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