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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be282b8d0e082eff89058c3d662409ed8e3c239571a99c6ef67b17b8640024f1' 
  AND token = 'DJLST6jUwcT0oeG7/0Q73jobRLWfSwiYzK02Zqo4c+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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