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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bf00930f3e89d0290024f519c2fd36c8225ed9ffe07d8633a3a875285787b3' 
  AND token = 'LEe5mqxH66VpChbD7rW2QIlcHuVywYjvFfpeXNzShF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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