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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f225bcaf7e6c48c4a29a6235e3b8847ffa6ca80f48e238f195a702ec025363' 
  AND token = 'fV3ZtXZ+nyLLgeoy2s4PqgHJAW7jXcGAp6LVLUkVbTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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