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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836cb5c8a428d2101a76384adc0c84b41c05594e7400ff91b402a75d23b7ff73' 
  AND token = 'Wg2177UEtu40i/Y+t9XKmP5PHMJrDmxXOWDuLoG6DxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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