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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d8316841ad41a3b9ef20eee5fc2ce6f546a3c118338aea0661ef1adfa11bf3' 
  AND token = '0pxADo61R1+JEtP3GNh1QRwZPSzdcHCEdWUGq03Sjyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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