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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc255cd66b6d8e4109532140f158d9fe5ee8e632edfde3615a83be1b8c618a5' 
  AND token = 'y1xPDnXWzJbOzTqoXLeyf02Kti8JD6GM8gsyXkmNwIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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