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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5168d4c1bbf58d570dd0ae1d40f35bb834bbe9b22cd1fa71172b99f23faf1f' 
  AND token = 'SMY96YxnCr+dtPdqaaeYsT9J+Mes5P4Gkjz8074a09I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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