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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3da2772c9b782bd9469fb63edca9676f6e2772c21c2bc6b9ffdf9b7a8544f87' 
  AND token = 'MvFCP2edn4kSgH3AtFX0IfpvYJroVMiNIeHNG+cxqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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