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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e1c700428e5f6f89cad4bb44c42291a176a9adc237633da6f85ab29deee440' 
  AND token = 'fOGsrJNqqaOhJBHUgLNlvG415z4I92erpVXYcrrpfmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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