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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9bd2a1308c9381b17c940567cf6bfbb436280d884f764ba21e70386d92d4be' 
  AND token = 'TZAJ2B9jg6b7EjfFv92JM1jst84Eya/+PlfqQmKzStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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