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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3128993c4f55a096a2a466535fda0d1815cd984491f7a929278dbfe9eefec612' 
  AND token = 'cjorhmiCMva+yGPV5ZuONpEBtX8TUIXl3fgd1dl2n1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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