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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fa005090cf31fd620557611a55d971c2151d152466f893a50cf6dd6728f558' 
  AND token = 'Z06TdM9a+vsQLrhyyvfe3d20SKRL0Ab8PNJpQgQhK8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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