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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da55dc0cd6b78d585f6f00c65d86ca5c87a06a89849a7e87ae5ec44805b3dc3' 
  AND token = 'gGBMiXX2oJhrszvaxYXWiq1OSIlRNATIBZGTRFG57Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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