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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ba51c7d1ca355924cfe65f596fc9a15be371241dab7428b6c03242881e35e8' 
  AND token = 'qR+ggwCCXQi96H4RkMhxiwtbeVU/k9cVbVa99EIRnLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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