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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bd0b6c0b560ef27f4091607779a6c2e07d313d9dae51ef95b2e5ec9a1f24f7' 
  AND token = 'wMvafCIYPBAf6gU0UhIPX7CKafb56o/vzlYkp2MENDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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