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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f78a95c93c5070826b3788440c9296b94bfc831a861b5209ab93f1ea1f9ae76' 
  AND token = '5IC50Kg4KPTBjEhxukmTeY+0BJdlU6lNBluL1GS7rT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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