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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e636e6ae61611de6e5c6c8bbfe20c9003676d5b9f7395513baaafea3ea239a5e' 
  AND token = '91+TxUgQ3PWdy1pGuTt00npd56WLIq67rKQmtWGjvAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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