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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c92104de7565a88031d7da65b741673196a84a8e53d52fef13ea024452fa74' 
  AND token = 'S35W2hkPSZhuQ863f8y46nQ73QceJ7DrLdMmuqEjHV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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