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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fe662cb5f3776084d59da92304076db63132501626464c12a413b381d4b49e' 
  AND token = '3FhZufHgeb4UvIMJewf/7cBuN6PbP7uWjv0nMm/NWk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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