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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7293c18edfc36a89be7e89d07b7328031392d165c45211bd07c2d9bc3358ba' 
  AND token = 'HfYko0apIEl5mEKI3Nm4YIkWOBdjDqv/naD3EO4pNyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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