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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad1a7b5410ddfbc4ba08c10856f963b737e5ba9cfaf146ed64d0897859190b7' 
  AND token = 'K1gTnU8b3lKm3UbZkTPdPpI4iCusviW70eDYluU5SCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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