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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7b64389f7a0ed68e93d5f7115a41f297c2d52768a3b68194645af0ccb9353e' 
  AND token = 'bNsnusZAUEWYLpNQ0ZdDbZQURJQpEuPUy3PLaWqB2yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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