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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d1cf9ea8e366aab794fb9b6fca77b26532f1efbbeedbb919d04f7296eb379b' 
  AND token = '9Gau4tZLF1CXO0IJe4LVK49NhKM71uheEcv70+FAh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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