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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef2e54efa5e2839be1fdc2b9c8ee700b06c8568667c45f764712d700baf73e8' 
  AND token = 'GjiQrSEbVBffJpswqn18g1EzkaQdKkyNcGHvd+8xr/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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