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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd29ff9e92d609e5052665d505412be30abbb626ef8099fd9b5bda293c8ff28' 
  AND token = 'mY9xiDgfSRkASbpDlO2i8H8CbhoM4/TluKkeLYVkusE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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