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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7154e8b55dfc4c5825307deab0778c0b4794b330f391a13626f8eec90009a6' 
  AND token = '2x1iIUcn4uyVtz9VJQApGknQ71VBoMPpHRluI9zsIkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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