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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f72e43dacd4e39962f2d9ca4f080649dea617511f1b0e13d9d36b89ba79f2a' 
  AND token = '8tkoh1Rwz8bCLokymsEMVujt/rYpbjRZ4edu1RYdH+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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